Apparatus for barking wood.



a A. A. ALFSEN.

i) APPARATUS FOR BARKING WOOD,

APPLICATION FILED FEB. 26, 1915.

1,148,136. Patented July 27, 1915.

2 SHEETS-SHEET I s3 INVENTOI? A. A. ALFSEN.

APPARATUS FOR BARKING WOOD.

4 APPLICATION FlLED FEB, 26, 1915. 1,148,1 36. Patented July 27, 1915.

2 SHEETSSHEET 2.

min/E8858 A7TORNEY sligmciih "em: ADOLF Norway made a elati f whic Man a 7'2, it may 00m inat I, eat of the King 9% .Hiinefes Norway have ntion W 00" 0 mien,

0 all 101101 Be 1t known sub and us if I 11 (4; Li )rw elination toward the discharge end which may also be promoted by giving the drum a slightly increased diameter at that end where the drum axis is substantially horizontal.

As indicated in the drawings two supporting tires 23, 26 are arranged adjacent each end of the drum and it is also desirable in most cases to use the additional intermediate tires in connection with cooperating bearing rolls and casings in the tank which are not shown for greater clearness. The reinforcing cylinder 8 may with advantage be formed with one or more series of large openings, such as 16, so as to give the desired freedom of access to the slots in this part of the drum and allow the washing of bark therethrough into the tank. The bark may be allowed to collect in the tank for several days or more at a time and then be removed therefrom by draining the tank as by raising the gate 19 in the side 18 of this tank so as to with:

draw the water and suspended bark in this way, additional water being used if desired to wash out any remaining portions of bark. An inclined discharge chute 16 may be arranged to cooperate with the open discharge end of the barking drum and may be arranged in connection with the rising side of the drum as indicated in Fig. 3, the remainder of the drum end being preferably closed, as for instance, by a stationary casing or partition, such as 21. A similar casing or partition 22 may be arranged adjacent theinlet end of the drum, there being arranged in connection therewith any suitable means to feed into the drum the sections of logs which are preferably elongated so as to have a length at least several times as great as their diameter which assists in maintaining their alinement within the drum and preventing their ends coming into undesirable contact with the drum ribs which might cause objectionable splintering of the wood. This chute 17 which is prefcrably arranged on the descending side of the drum may be vertically inclined and may also be preferably inclined in a horizontal direction as shown in Fig. 3, so as to direct the logs 20 toward the inner walls of the ol'rum on'its descending side where there is normally a free space under operating conditions so that the entering logs can assume a position substantially parallel to the drum axis and sides.

Under the manufacturing conditions in Norway where the logs have a diameter up to about a foot, they are given a uniform length of about two and one-half to three feet and the barking drums may be given an internal diameter of about six or seven feet or so. Under American conditions where thev wood runs considerably larger up to a diameter of something like two feet tumbling process.

it is desirable to have the logs correspondingly longer and the drums may with advantage he given a diameter of ten or twelve feet or more and their length may be made as great as desired in connection with convenience of construction and operation. It is also desirable to avoid excessive differences in size of the logs which are fed into the drum at any one time, since otherwise there is a tendency for the smaller logs to be fed through the drum and discharge more rapidly'than those of large diameter and weight.

Under normal operating conditions the charge of logs may fill the interior of the drum. up to about half its capacity as roughly indicated in Fig. 2 and be continually agitated and tumbled by the rotation of the drum which carries upward the logs in contact with the ribbed walls of the drum and then drops them over the other logs of the charge into contact therewith and with. the barking ribs or project-ions on the drum itself. This loosens and breaks oil the bark adhering to the logs and the energetic washing action of the water in the bottom of the drum washes the ends of the bark through the slots in the periphery of the drum so that it becomes more or less entangled and held there in connection with the logs which roll over it so that the bark is torn and knocked off the logs and finally washed out through the drum slots and remains suspended in the water in the the wood itself such as is incident to the usual barking processes and the process may be substantially automatic and effected with a relatively slight expenditure'of power.

If desired the logs may be fed into the drum in a substantially continuous manner by feeding them in preferably toward the wall of the drum on its descending side so that these entering logs are brought into proper alinement with the other logs of the charge and maintained in position substantially parallel to the drum axis during this The incoming logs form a heap at this end of the drum and this heap. exerts a pressure in axial direction on the other logs, whereby is caused a gradual feeding of the logs, longitudinally through the barking drum so that they are automatically discharged in a substantially continllO ders of steps, to the details of which disclosure the invention is not of course to be limited.

lVhat is claimed as new and What is desired to be secured by Letters Patent is set forth in the appended claims.

1. The apparatus for barking wood comprising an open-ended substantially cylindrical barking drum havinga length several times as great as its diameter and having perforated sides, tires mounted on said drum, a water tank inelosing the lower portion of said drum, bearing rolls in said tank 006 eratin with said tires roll casin s substantially inclosing said rolls, rings on said drum adjacent said tires and substantially closing the upper ends of said casings, means to rotate said druni.

2. The apparatus for barking wood comprising an open-ended elongated substantially cylindrical horizontally mounted barking drum having sides consisting largely of separated angle irons extending substantially the full length of the drum drum having sides consisting largely o 7 angle iron extending substantially the full length of the drum and secured to rings, tires mounted on said rings, bearing rolls cooperating with said tires, roll casings substantially inclosing said rolls and having their upper ends substantially closed by the cooperating rings on said drum and a water tank inclosing the lower part of said drum to Wash the disengaged bark through the openings in the sides of said drum.

' ADOLF A. ALFSEN.

Witnesses:

THs. Anne, M. RISER. 

